package cn.kgc.educenter.controller;

import cn.kgc.commonutils.JwtUtils;
import cn.kgc.educenter.entity.UcenterMember;
import cn.kgc.educenter.service.UcenterMemberService;
import cn.kgc.educenter.utils.HttpClientUtils;
import cn.kgc.educenter.utils.Wxutils;
import cn.kgc.servicebase.exceptionhandler.GuliException;
import com.google.gson.Gson;
import io.swagger.annotations.Api;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;

import javax.servlet.http.HttpSession;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.HashMap;

/**
 * @ClassName WxApiController
 * @Description: TODO
 * @Author :郭建宾
 * @Date 2020/7/15
 * @Version V1.0
 **/
@Api(tags = "微信扫码")
//@CrossOrigin
@Controller//注意这里没有配置 @RestController
@RequestMapping("/api/ucenter/wx")
public class WxApiController {

    @Autowired
    private UcenterMemberService memberService;
    @GetMapping("callback")
    public String callback(String code, String state, HttpSession session) {
        try {
            //得到授权临时票据code
            System.out.println("code = " + code);
            System.out.println("state = " + state);
            //从redis中将state获取出来，和当前传入的state作比较
            //如果一致则放行，如果不一致则抛出异常：非法访问

            //向认证服务器发送请求换取access_token
            String baseAccessTokenUrl = "https://api.weixin.qq.com/sns/oauth2/access_token" +
                    "?appid=%s" +
                    "&secret=%s" +
                    "&code=%s" +
                    "&grant_type=authorization_code";

            String accessTokenUrl = String.format(baseAccessTokenUrl,
                    Wxutils.WX_OPEN_APP_ID,
                    Wxutils.WX_OPEN_APP_SECRET,
                    code);
            String accessTokenInfo = HttpClientUtils.get(accessTokenUrl);
            System.out.println(accessTokenInfo);
            //解析json
            Gson gson = new Gson();
            HashMap<String, Object> mapUserInfo = gson.fromJson(accessTokenInfo, HashMap.class);
            String access_token = (String) mapUserInfo.get("access_token");
            String openid = (String) mapUserInfo.get("openid");


             //把扫描人信息添加数据库
             // 判断数据库里是否在相同微信信息，根据openid判断
            UcenterMember member =memberService.getOpenIdMember(openid);

            if(member == null){
                //访问微信的资源服务器，获取用户信息
                String baseUserInfoUrl = "https://api.weixin.qq.com/sns/userinfo" +
                        "?access_token=%s" +
                        "&openid=%s";

                String userInfoUrl = String.format(
                        baseUserInfoUrl,
                        access_token,
                        openid);
                //发送请求
                String resultUserInfo = HttpClientUtils.get(userInfoUrl);
                System.out.println(resultUserInfo);


                //解析json
                HashMap userInfo = gson.fromJson(resultUserInfo, HashMap.class);
                String nickname = (String)userInfo.get("nickname");
                String headimgurl = (String)userInfo.get("headimgurl");

                member = new UcenterMember();
                member.setOpenid(openid);
                member.setAvatar(headimgurl);
                member.setNickname(nickname);
                memberService.save(member);
            }

            // 生成jwt
            String token = JwtUtils.getJwtToken(member.getId(),member.getNickname());

            //返回首页
            return "redirect:http://localhost:3000?token=" + token;
        }catch (Exception e){
            throw  new GuliException(20001,"登录失败");
        }
        


    }
    //生成微信扫描二维码
    @GetMapping("login")
    public String getWxCode(){
        // 微信开放平台授权baseUrl
        String baseUrl = "https://open.weixin.qq.com/connect/qrconnect" +
                "?appid=%s" +
                "&redirect_uri=%s" +
                "&response_type=code" +
                "&scope=snsapi_login" +
                "&state=%s" +
                "#wechat_redirect";

        // 回调地址
        String redirectUrl = Wxutils.WX_OPEN_REDIRECT_URL; //获取业务服务器重定向地址
        try {
            redirectUrl = URLEncoder.encode(redirectUrl, "UTF-8"); //url编码
        } catch (UnsupportedEncodingException e) {
            throw new GuliException(20001, e.getMessage());
        }

        // 防止csrf攻击（跨站请求伪造攻击）
        //String state = UUID.randomUUID().toString().replaceAll("-", "");//一般情况下会使用一个随机数
        String state = "imhelen";//为了让大家能够使用我搭建的外网的微信回调跳转服务器，这里填写你在ngrok的前置域名
        System.out.println("state = " + state);

        // 采用redis等进行缓存state 使用sessionId为key 30分钟后过期，可配置
        //键："wechar-open-state-" + httpServletRequest.getSession().getId()
        //值：satte
        //过期时间：30分钟

        //生成qrcodeUrl
        String url = String.format(
                baseUrl,
                Wxutils.WX_OPEN_APP_ID,
                redirectUrl,
                state);

        return "redirect:" + url;
    }
}
